Airfoil cooling passage trailing edge flow restriction
a technology of airflow restriction and trailing edge orifice, which is applied in the direction of air transportation, climate sustainability, engine fuction, etc., can solve the problems of difficulty in appropriately sizing the trailing edge orifice of an internally cooled airfoil, the difficulty of metering the air principally, and the difficulty of providing an airfoil requiring less than 0.020 inch orifice size, etc., to facilitate the manufacture of a cooled airfoil
Active Publication Date: 2007-10-09
PRATT & WHITNEY CANADA CORP
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AI Technical Summary
Benefits of technology
The present invention provides a new flow control device for a cooled airfoil that makes it easier to manufacture. The airfoil has an internal cooling path and at least one exit aperture through which cooling air leaves the airfoil. The flow of cooling air is metered restricted immediately upstream of the exit aperture by a flow metering orifice integral to the airfoil. This helps to control the overall airflow exiting the airfoil and ensures optimal cooling performance. The invention also includes a casting core for use in manufacturing the airfoil, a method of making the airfoil, and a method of controlling the airflow through the airfoil.
Problems solved by technology
It is difficult to appropriately size the trailing edge orifices of an internally cooled airfoil in order to efficiently meter the flow of cooling air leaving the airfoil.
The difficulty of metering the air principally arises because of manufacturing constraints.
It is therefore difficult to provide an airfoil requiring a less than 0.020 inch orifice size.
An oversize orifice, however, result in wasted cooling air efficiency.
Method used
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[0016]FIG. 1 illustrates a gas turbine engine 10 of a type preferably provided for use in subsonic flight, generally comprising in serial flow communication a fan 12 through which ambient air is propelled, a multistage compressor 14 for pressurizing the air, a combustor 16 in which the compressed air is mixed with fuel and ignited for generating an annular stream of hot combustion gases, and a turbine section 18 for extracting energy from the combustion gases.
[0017]The turbine section 18 comprises one or more stages of stationary vanes and rotating blades. The present invention is applicable to either one of these types of airfoil, one of which is generally designated by numeral 20 in FIG. 2.
[0018]The airfoil 20 comprises a hollow airfoil body 22 over which flows hot combustion gases emanating from the combustor 16. The hollow airfoil body 22 generally comprises a pressure side wall 24 and a suction side wall 26 joined together at longitudinally extending leading and trailing edges ...
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Abstract
An internal metering structure permits the exit apertures of a cooled airfoil to be sized to provide for easy manufacturability.
Description
TECHNICAL FIELD[0001]The invention relates to internally cooled airfoils for gas turbine engines.BACKGROUND OF THE ART[0002]It is difficult to appropriately size the trailing edge orifices of an internally cooled airfoil in order to efficiently meter the flow of cooling air leaving the airfoil. The difficulty of metering the air principally arises because of manufacturing constraints. For example, internally cooled airfoils are typically cast using a ceramic core, and a minimum core thickness (about 0.020 inch) must usually be maintained to prevent core breakage upon removal. It is therefore difficult to provide an airfoil requiring a less than 0.020 inch orifice size. An oversize orifice, however, result in wasted cooling air efficiency.[0003]Accordingly, there is a need to provide a new airfoil cooling flow metering device which addresses these and other limitations of the prior art.SUMMARY OF THE INVENTION[0004]It is therefore an object of this invention to provide a new flow con...
Claims
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IPC IPC(8): F01D5/08
CPCF01D5/187F01D5/189F05D2240/122Y10T29/4932Y02T50/676F05D2230/21F05D2260/20F05D2240/304Y02T50/60
Inventor BLASKOVICH, TIMOTHYLEBEL, LARRYTRINDADE, RICARDO
Owner PRATT & WHITNEY CANADA CORP